IntelliJ IDEA 13 may also throw a “IDEA hook: Grails not found!” error.

This is due to a dependency of shiro on hibernate-2.2.4 api.

Soution 3:

runtime (":shiro:1.2.0") {
excludes "hibernate"
}

Verification 3:

Delete target/*
grails compile

One way to sort out such errors is to run the grails dependency-report and look for the jar file which causes the problem. Trace back from jar file to the actual included plugin or dependency and add the excludes in either dependencies section or plugins section appropriately.